How do i select similar sides of a face loop
Choose the face with edge loop select Alt + LMB: 



Click the side you want them to propagate, ideally on the edge (the red circle position).

Sometime it won't propagate correctly, the you might need to switch between face and edge select mode until one is working correclty. If none of them work, then their must be some topology issue that cannot treat those face as a loop (eg. got a diverse face in middle)